Concept explainers
For the preceding question, which of the following equationsbest represents the reaction?
a.
b.
c.
d.
e.
Justify your choice. For those you did not choose, explainwhy they are incorrect.
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EBK CHEMICAL PRINCIPLES
- Complete and balance each of the following molecular equations for strong acid/strong base reactions. Underline the formula of the salt produced in each reaction. msp;NNO3(aq)+KOH(aq) msp;H2SO4(aq)+Ba(OH)2(aq) msp;HClO4(aq)+NaOH(aq) msp;HCl(aq)+Ca(OH)2(aq)arrow_forwardWhich of the following statements about chemical reactions is false? l type='a'> When balancing a chemical equation, all subscripts must be conserved. i>When one coefficient is doubled, the rest of the coefficients in (he balanced equation must also be doubled. i>The subscripts in a balanced equation tell us the number of atoms in a molecule. i>The phases in a chemical reaction tell us the nature of the reactants and products.arrow_forwardOne of relatively few reactions that takes place directly between two solids at room temperature is Ba(OH)2+8H2O(s)+NH4SCN(s)Ba(SCN)2(s)+H2O(l)+NH3(g) In this equation, the 8H2O in Ba(OH)2 8H2O indicates the presence of eight water molecules. This compound is called barium hydroxide octahydrate. a. Balance the equation. b. What mass of ammonium thiocyanate (NH4SCN) must be used if it is to react completely with 6.5 g barium hydroxide octahydrate?arrow_forward
- Magnesium metal (a component of alloys used in aircraft and a reducing agent used in the production of uranium, titanium, and other active metals) is isolated from sea water by the following sequence of reactions: Mg2+(aq)+Ca(OH)2(aq)Mg(OH)2(s)+Ca2+(aq)Mg(OH)2(s)+2HCl(aq)MgCl2(s)+2H2O(l)MgCl2(l)electrolysisMg(s)+Cl2+Cl2(g) Sea water has a density of 1.026 g/cm3 and contains 1272 parts per million of magnesium a5 Mg2+(aq) by mass. What mass, in kilograms, of Ca(OH)2; is required to precipitate 99.9% of the magnesium in 1.00103 L of sea water?arrow_forwardWhat is a combustion reaction? Are combustion reactions a unique type of reaction, or are they a special case of a more general type of reaction? Write an equation that illustrates a combustion reaction.arrow_forwardYou want to prepare barium chloride, BaC12, using an exchange reaction of some type. To do so, you have the following reagents from which to select the reactants: BaSO4, BaBr2, BaCO3, Ba(OH)2, HCI, HgSO4, AgNO3, and HNO3. Write a complete, balanced equation for the reaction chosen. (Note: There are several possibilities.)arrow_forward
- ABS plastic is a tough, hard plastic used in applications requiring shock resistance. The polymer consists of three monomer units: acrylonitrile (C3H3N), butadiene (C4H6), and styrene (C8H8). a. A sample of ABS plastic contains 8.80% N by mass. It took 0.605 g of Br2 to react completely with a 1.20-g sample of ABS plastic. Bromine reacts 1: 1 (by moles) with the butadiene molecules in the polymer and nothing else. What is the percent by mass of acrylonitrile and butadiene in this polymer? b. What are the relative numbers of each of the monomer units in this polymer?arrow_forwardhy is the formation of a gas evidence of a chemical reaction? Use a molecular-level drawing in your explanation.arrow_forwardPolychlorinated biphenyls (PCBs) have been used extensively as dielectric materials in electrical transformers. Because PCBs have been shown to be potentially harmful, analysis for their presence in the environment has become very important. PCBs are manufactured according to the following generic reaction: C12H10+nCl2C12H10nCln.+nHCl This reaction results in a mixture of PCB products. The mixture is analyzed by decomposing the PCBs and then precipitating the resulting Cl asAgCl. a. Develop a general equation that relates the average value of n to the mass of a given mixture of PCBs and the mass of AgCl produced. b. A 0.1947-g sample of a commercial PCB yielded 0.4791 g of AgCl. What is the average value of n for this sample?arrow_forward
- Consider the following generic equation: H+(aq)+ B(aq)HB(aq)For which of the following pairs would this be the correct prototype equation for the acid-base reaction in solution? If it is not correct, write the proper equation for the acid-base reaction between the pair. (a) nitric acid and calcium hydroxide (b) hydrochloric acid and CH3NH2 (c) hydrobromic acid and aqueous ammonia (d) perchloric acid and barium hydroxide (e) sodium hydroxide and nitrous acidarrow_forwardixing an aqueous solution of potassium nitrate with an aqueous solution of sodium chloride does not result in a chemical reaction. Why?arrow_forwardIt is stated in Section 6.3 of the text that to balance equations by inspection you start “with the most complicated molecule.” What does this mean? Why is it best to do this?arrow_forward
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